The hybridization of the surface orbitals of thin ferromagnetic layers with mole-cular orbitals represents a soft but efficient technology that is able to induce in ferromagnetic component radical modifications of the key magnetic param-eters, such as magnetization, magnetic anisotropy, and others. These effects are investigated in 7 nm thick polycrystalline Co films interfaced with C60 and Gaq3 molecular layers by combining 59Co Ferromagnetic nuclear resonance spectroscopy (FNR) and magneto-optic kerr effect (MOKE) techniques. It is demonstrated that the surface hybridization produces a significant magnetic hardening with respect to a reference Co/Al system and that the molecule-induced effects modify the magnetic properties of entire Co layer, propagating for several nm from the interface. The FNR spectroscopy also reveals a recon-struction of the magnetic environment at the cobalt surface, whose observa-tion in polycrystalline films is especially intriguing. The results shed new and unexpected light on the interfacial physics in such systems, whose under-standing necessitates further experimental and theoretical research.

In-Depth NMR Investigation of the Magnetic Hardening in Co Thin Films Induced by the Interface with Molecular Layers / Benini, M.; Allodi, G.; Surpi, A.; Riminucci, A.; Lin, K. -W.; Sanna, S.; Dediu, V. A.; Bergenti, I.. - In: ADVANCED MATERIALS INTERFACES. - ISSN 2196-7350. - 9:36(2022), pp. 2201394.1-2201394.8. [10.1002/admi.202201394]

In-Depth NMR Investigation of the Magnetic Hardening in Co Thin Films Induced by the Interface with Molecular Layers

Allodi G.
Investigation
;
Sanna S.;Bergenti I.
2022-01-01

Abstract

The hybridization of the surface orbitals of thin ferromagnetic layers with mole-cular orbitals represents a soft but efficient technology that is able to induce in ferromagnetic component radical modifications of the key magnetic param-eters, such as magnetization, magnetic anisotropy, and others. These effects are investigated in 7 nm thick polycrystalline Co films interfaced with C60 and Gaq3 molecular layers by combining 59Co Ferromagnetic nuclear resonance spectroscopy (FNR) and magneto-optic kerr effect (MOKE) techniques. It is demonstrated that the surface hybridization produces a significant magnetic hardening with respect to a reference Co/Al system and that the molecule-induced effects modify the magnetic properties of entire Co layer, propagating for several nm from the interface. The FNR spectroscopy also reveals a recon-struction of the magnetic environment at the cobalt surface, whose observa-tion in polycrystalline films is especially intriguing. The results shed new and unexpected light on the interfacial physics in such systems, whose under-standing necessitates further experimental and theoretical research.
2022
In-Depth NMR Investigation of the Magnetic Hardening in Co Thin Films Induced by the Interface with Molecular Layers / Benini, M.; Allodi, G.; Surpi, A.; Riminucci, A.; Lin, K. -W.; Sanna, S.; Dediu, V. A.; Bergenti, I.. - In: ADVANCED MATERIALS INTERFACES. - ISSN 2196-7350. - 9:36(2022), pp. 2201394.1-2201394.8. [10.1002/admi.202201394]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2937275
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